Scroll bar keeps sliding while using internet

While using the internet, on certain web-pages, the scroll bar keeps sliding down or up and page will turn dark in color. I have linux operating system. What is causing this and how can I fix the problem.

Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
Can you post a link where you see this?

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